The Nature of Metastable AA' Graphite: Low Dimensional Nano- and Single-Crystalline Forms.

ABSTRACT: Over the history of carbon, it is generally acknowledged that Bernal AB stacking of the sp² carbon layers is the unique crystalline form of graphite. The universal graphite structure is synthesized at 2,600~3,000?°C and exhibits a micro-polycrystalline feature. In this paper, we provide evidence for a metastable form of graphite with an AA' structure. The non-Bernal AA' allotrope of graphite is synthesized by the thermal- and plasma-treatment of graphene nanopowders at ~1,500?°C. The formation of AA' bilayer graphene nuclei facilitates the preferred texture growth and results in single-crystal AA' graphite in the form of nanoribbons (1D) or microplates (2D) of a few nm in thickness. Kinetically controlled AA' graphite exhibits unique nano- and single-crystalline feature and shows quasi-linear behavior near the K-point of the electronic band structure resulting in anomalous optical and acoustic phonon behavior.

SUBMITTER: Lee JK 

PROVIDER: S-EPMC5175192 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature